Back to EveryPatent.com
United States Patent | 5,025,160 |
Watt | June 18, 1991 |
Time varying measurements indicative of the ratio of mass absorption coefficients of the components of a multiphase flow containing at least two liquid phases at two spaced apart locations are cross correlated to determine liquid flow velocity. The time varying measurements are provided by measuring the intensities of gamma-rays transmitted through a selected volume of the flow at two different gamma-ray energies. At least one of the gamma-ray energies has substantially different mass absorption coefficients in each of the two liquids. Gas velocity, when gas is present, and component fractions of all components are determined using a dual energy gamma-ray transmission technique and with the liquid flow velocity are used to derive mass flowrates.
Inventors: | Watt; John S. (New South Wales, AU) |
Assignee: | Commonwealth Scientific and Industrial Research Organisation (AU) |
Appl. No.: | 359377 |
Filed: | May 31, 1989 |
Jun 03, 1988[AU] | 8611 |
Current U.S. Class: | 250/356.1 |
Intern'l Class: | G01F 001/00 |
Field of Search: | 250/356.1 |
4228353 | Oct., 1980 | Johnson | 250/356. |
4282433 | Aug., 1981 | Loffel | 250/356. |
4301400 | Nov., 1981 | Paap | 324/58. |
Foreign Patent Documents | |||
2652872 | May., 1978 | DE | 250/356. |
2083908 | Mar., 1982 | GB. | |
2088050 | Jun., 1982 | GB. |
Beck, M. S., Plaskowski, A., "Cross Correlation Flowmeters", Adam Hilger, Bristol, 1987, pp. 23, 26, 27 and 103. Beck et al., "On-Line Measurement of Oil/Gas/Water Mixtures, Using a Capacitance Sensor", vol. 3, No. 1, Jan.-Mar. 1985, pp. 7-14. Fanger et al., "Nuclear Techniques and Mineral Resources 1977", Mar. 7-10, 1977, pp. 539-550. Abouelwaffa et al., "The Measurement of Component Ratios in Multiphase Systems Using Gamma-Ray Attenuation", 1980, pp. 341-345. Tomada et al., "Development of Gamma-Ray Oil/Water/Gas Fraction Meter for Crude Oil Production Systems", Sep. 22-23, 1987, pp. 1-21. Stuchly et al., "Advances in Monitoring of Velocities and Densities of Particulates Using Microwave Doppler Effect", Mar. 1977, vol. IM-26, No. 1, pp. 21-24. Liu et al., "Net-Oil Computer Improves Water-Cut Determination", Dec. 1988, pp. 41-45. |